Compile on VS2015

[skyline75489]

Big thanks for making this project & sharing it with the rest of us.

I'm working on Windows and I've managed to make this compile with VS2015. The changes are actually very limited.

First, VC++ doesn't recognize __attribute so __attribute__((noreturn)) cannot be used. The alternative is __declspec(noreturn) but it requires to be placed at the beginning for declaration like this:

__declspec(noreturn) extern void fatal () {}  

Second and isn't recognized as keyword so we need to use &&.

And last there's min/max macro defined somewhere in windows.h and causing name collision.

My commit is https://github.com/skyline75489/Configuru/commit/777795ee3bd54df268ab5aca758ef64ca43eaa7e

If it looks OK to u I can send you a PR. 🥂

[emilk]

You are welcome, and thank you for your contribution! It has been merged to master in 6a703a5